I am considering a Litchi mission with my P3A that will involve going up and down the side of a mountain. The elevation at the top is about 1,000 feet higher than the start point. How should I approach this, so that I be assured that I keep the craft flying ABOVE the mountain and not INTO it? I imagine that all elevations in the mission must be relative to the home point? It's not a straight line up the hill - there are cliffs, relatively level areas, etc.